Effects of Inquiry-Based Learning Strategies on Chemistry Students’ Conceptions In Chemical Kinetics And Equilibrium

American Journal of Humanities and Social Sciences Research (AJHSSR) 2018
A J H S S R J o u r n a l P a g e | 7
American Journal of Humanities and Social Sciences Research (AJHSSR)
e-ISSN : 2378-703X
Volume-02, Issue-07, pp-07-14
www.ajhssr.com
Research Paper Open Access
Effects of Inquiry-Based Learning Strategies on Chemistry
Students’ Conceptions in Chemical Kinetics and Equilibrium
1
Ikeoluwa Folasade ADEOYE (Ph. D), 2
Prof. Duro AJEYALEMI
1
School of Science, Emmanuel Alayande College of Education, Oyo, Oyo State, Nigeria
2
Department of Science and Technology Education, University of Lagos, Lagos State, Nigeria.
ABSTRACT: The study identified Senior Secondary School II (SS2) students’ misconceptions and determined
the effect of inquiry-based learning strategies: Investigate Discuss (ID), Predict-Discuss-Investigate-Discuss
(PDID) and Teacher Demonstration (TD) on students’ conceptual knowledge at macroscopic, microscopic and
symbolic levels in chemical kinetics and equilibrium. The pre-test post-test quasi experimental control group
design as adopted. 359 SS2 chemistry students were randomly sampled from nine public schools in Lagos
States, Nigeria. The validated Conceptual Knowledge Test (CKT) was easy test, structured to reflect the three
levels of conceptual knowledge was the major instrument for the study. There were operational guides for the
learning strategies which comprised eight practical activities that had same contents but different procedural
steps in their implementations. The mean, simple percentage and bar chat were used in analysing students
responses to pre-test and post-test of CKT. The study identified the students’ misconceptions in chemical
kinetics and equilibrium. The results indicated that the ID followed by the PDID was more effective in
promoting conceptual knowledge of microscopic and symbolic levels in chemical kinetics and equilibrium. The
ID and PDID learning strategies are recommended for chemistry teaching to improve students’ achievement in
conceptual knowledge at microscopic and symbolic levels of content representations in chemistry.
KEYWORDS: Conceptual knowledge, learning difficulties, content representation levels, Predict - Discuss -
Investigate - Discuss, Investigate - Discuss, Teacher Demonstration
I. INTRODUCTION
Chemistry should be learnt at three levels of content representations: macroscopic, microscopic and
symbolic for meaningful understanding of the chemical concepts (Gilbert & Treagust, 2009; Adeoye, 2011 and
Adesoji & Omilani (2012). The macroscopic level corresponds to knowledge acquired through observation of an
object such as physical properties, change of states of matter, solubility and precipitation of solutes among
others. The microscopic level uses the particulate nature of atoms to explain the concepts, principles and
theories of the observable phenomena while the symbolic level involves the use of chemical symbols, formulae,
reaction mechanism, chemical equations to represent phenomena at macroscopic and microscopic levels. It is
pertinent that chemistry students at all levels of education have adequate knowledge of scientific concepts at the
three levels and should be able to integrate the knowledge across the levels with ease (Gilbert & Treagust,
2009).
Research findings have shown that a huge gap existed between the intended chemistry curriculum and
actual happenings when students learn chemistry. Students’ inability to demonstrate good understanding of very
basic concepts of the subject has been reported (Ali, 2012). The students’ inadequacies in scientific concepts are
refered to as misconceptions or alternative conceptions (Harizal, 2012). Several misconceptions have been
identified in some topics in chemistry such as particulate nature of matter and chemical bonding (Othman,
Treagust & Chandrasegaran, 2008), acid-base (Harizal, 2012), chemical thermodynamic (Sokrat, Tamani &
Radid, 2014), periodicity (Satilmis, 2014) and redox reaction (Shehu, 2015). The commonly reported difficult
chemistry topics in Nigeria context are redox reactions, electrolysis, chemical equilibrium, chemical kinetics,
mole concepts and stoichiometry (WAEC, 2009-2013). Some of the identified reasons for students’
misconceptions include: lack of deep conceptual knowledge; inability to integrate ideas to coherent conceptual
framework; inability to represent the macroscopic to microscopic and symbolic concepts, inadequate basic
mathematical knowledge and inadequate methods of the teaching (Kolomuc & Calik, 2012; Sokrat, Tamani &
Radid, 2014 and Shehu, 2015). Misconceptions impede learning of new concepts which result into poor
performance of students in chemistry (Taber, 2009 and Satilmis, 2014). Sakiyo & Badau (2015) indicated that
the average performance of Nigeria students in chemistry who obtained grade 1-6 was 46.30 % in West African
Senior School Certificate Examination (WASSCE) from 2008 - 2012.

It is necessary to identify and remediate students’ misconceptions in chemical concepts through appropriate
instructional strategies. Obviously, ordinary form of instruction such as lectures, laboratory activities, discovery
learning or simply reading textbooks are not very successful at overcoming students’ misconceptions in some
chemistry topics (Burgoon, Heddle & Duran, 2010). Several instructional strategies have proven to be effective
in achieving conceptual change and assist to learn correct concepts in science. Ozmen (2011) suggested
computer animation for nature of matter and transformation, conceptual change oriented instruction through
demonstrations for rate of reaction by Kaya & Geban (2012), Intervention Discussion Learning Model (IDLM)
for chemical bonding by Ikenna (2015), inquiry-based/guided discovery teaching strategies (Adekunle, 2015
and Maxwell, Lambeth & Cox, 2015) and V-shape and conflict map learning strategies for chemical kinetics
(Adeoye, 2017) . Students must be actively involved in learning by construction and reorganisation of their
previous experiences. These would be more beneficiary for meaningful learning in chemistry (Ajeyalemi, 2011
and Adeoye, 2016).
The emphasis in the assessment of students’ learning difficulty of chemistry concepts is currently based
on students’ achievement in macroscopic, microscopic and symbolic. However, there is limited studies on the
effectiveness of learning strategies on the students achievement at the three levels of contents representations in
chemistry especially in chemical kinetics and equilbrium.
II. PURPOSE OF THE STUDY
The purpose of the study was to determine students’ achievement in chemical kinetics and chemical
equilibrium and to identify some common students’ misconceptions in the topics. The study also examined
the effect of inquiry-based learning strategies on students’ conceptual knowledge at the three levels of
content representations. The specific objectives are to:
a. Determine study achievement in chemical kinetics and chemical equilibrium
b. Identify students’ misconceptions in chemical kinetics and chemical equilibrium.
c. Examine the effect of inquiry-based learning strategies on students’ conceptual knowledge in chemical
kinetics and chemical equilibrium.
d. Determine the effect of inquiry-based learning strategies on students’ conceptions at the three levels of
content representation in chemical kinetics and chemical equilibrium.
III. RESEARCH QUESTIONS
a. How do the students achieve on chemical kinetics and chemical equilibrium before treatment?
b. What are the students’ misconceptions in chemical kinetics and chemical equilibrium?
c. What are the effects of the inquiry-based learning strategies on students’ conceptual knowledge in
chemical kinetics and chemical equilibrium?
d. How do the inquiry-based learning strategies affect students’ conceptions at the three levels of content
representation in chemical kinetics and chemical equilibrium?
IV. METHODOLOGY
The quasi-experimental research design of pre-test and post-test experimental control groups were
employed to determine the effect of three inquiry-based learning strategies on students’ conceptual
understanding.
Three hundred and fifty nine (359) senior secondary II (SS2) chemistry students were randomly sampled
from nine public secondary schools in Lagos State, Nigeria. The schools were grouped into three designated
treatment groups as Predict-Discuss-Investigate-Discuss (PDID), Investigate-Discuss (ID) and Teacher
Demonstration (TD). The students in their intact classes randomly sampled, comprised 114 students for the ID
treatment group, 123 students for the PDID while the TD group had 122 students. The PDID and ID were
student-centred learning strategies while the TD was teacher-centred approach to teaching. All the sampled
students in the three learning strategies were exposed to four weeks of practical activities in chemical kinetics
and equilbrium. The procedures for implementing learning contents were different.The chemistry teachers in the
sampled schools were trained on the learning statrategies as they were applicable to the schools. The learning
strategies were based on the constructivism theories of learning of Dewey, Piaget, Bruner, Vygotsky and
Ausubel which stressed that knowledge is constructed and co-constructed among knowledgeable peers from the
environment. Trowbridge & Bybee (1990) and Kolb’s (1988) experiential learning a four-stage cyclic model
that involves concrete experience, reflective observation, abstract conceptualization and active experimentation
using 5Es learning processes (Engage, Explore, Explain, Elaborate and Evaluate).
The students in the PDID and ID treatment groups learnt in small discussion group of 5 to 6 members in a
group. The PDID students made predictions and discuss the predictions of experimental outcomes before
carrying out the investigation. The results of the investigation were also discussed. The students modified their
predictions as they discussed and carried out investigation.

The students in ID carried out investigations and discussed their findings with their peers without making
predictions. In the TD, the teachers carried out the investigations without the assistance of the students. The
teachers explained the underlying principles and theories of the practical activities. The trained teachers in the
PDID and ID facilitated learning and modified students discussions where necessary while the teacher in TD
acted as custodian of knowledge and the students, as passive learners.
V. RESEARCH INSTRUMENT
There were operational guides for the three learning strategies which contained eight practical activities
structured to reflect the learning strategies 1 hour for each practical activity per week.
The Conceptual Knowledge Test (CKT) research instrument was structured by the researchers to determine
the students’ conceptual knowledge at macroscopic, microscopic and symbolic levels of content understanding
on the chemistry topics. The CKT contained eight open-ended questions: two questions on each of the four
chemistry topics, with three sub-questions. The CKT was validated and reliability coefficient value was 0.73.
The instrument was pre-administered to the samples before treatment and post- administered two days after the
treatment.
VI. ANSWERS TO RESEARCH QUESTIONS
The students’ scores on pre-test post-test were analysed using mean and simple percentage to provide
answers to the research questions raised for the study.
Research Question 3a: How do the students achieve on chemical kinetics and chemical equilibrium before
treatment?
Based on the results presented on Table 1, the students’ percentage score before treatment was 30.75 % of
which the percentage score of the students were 15.81 % for chemical kinetics and chemical equilibrium had
14.94 %. The score indicated that students have learning difficulties in chemical kinetics and chemical
equilibrium. The percentage score of the students after the treatment was 46.65 % out of which chemical
kinetics had 23. 06 % while chemical equilibrium had 23.58 %. This showed an improvement in the students’
scores. If inquiry-based learning strategies are to be used in engaging chemistry students in the topics for a long
period of time, the learning strategies are capable of eliminating or alleviating students’ learning difficulties in
the areas of chemistry. The students’ achievement by learning strategies was examined.
Table 1: Students Mean Achievement in Conceptual Knowledge Test by Topic
Treatment Test Mean
Chemical
Kinetics
Mean Chemical
Equilibrium
Total
Mean
ID
Pre-test
Post-test
Mean Gain
7.71
11.73
4.02
6.96
12.21
5.25
14.67
23.94
9.27
PDID
Pre-test
Post-test
Mean Gain
8.32
11.03
2.71
5.80
10.05
4.25
14.12
21.08
6.96
TD
Pre-test
Post-test
Mean Gain
6.76
10.45
3.69
8.74
11.70
2.96
15.50
22.15
6.65
Average
Pre-test
Post-test
Mean Gain
7.59
11.07
3.48
7.17
11.32
4.15
14.76
22.39
7.63
Source: Adeoye (2016)
Research Question 3b: What are the students’ learning difficulties in chemical kinetics and chemical
equilibrium?
The identified learning difficulties and the expected knowledge from the students in chemical kinetics and
chemical equilibrium are as follows:

Chemical Kinetics
For chemical kinetics, the students found it difficult to:
 State two factors that determine whether or not the collision of two reacting particles
would lead to formation of products.
(i) There must be effective collision because not all collisions lead to formation of
products.
(ii) Energy of collision must be equal or greater than activated energy.
 Draw an energy profile for a catalysed exothermic reaction. Some of the students did not
know that both catalysed and uncatalysed energy profile would be on the same diagram.
Some drew the energy profile correctly but failed to label and indicate activated complex,
activation energy and enthalpy change diagram.
 Concisely describe the effects on the rate of reaction when pressure of A is doubled in
this reaction: A(g) + B(g) C(s) + D(g ) H = - 210 KJmol-1
When pressure of A is doubled, reactant particles collide more often if they are crowded in a
small space i.e. frequency of collision is dependent upon pressure. An increase in pressure,
results in a corresponding increase in effective collision of the particles of A and hence in the
reaction rate.
Chemical Equilibrium
In chemical equilibrium, the students encountered difficulties in:-
 Identifying and writing chemical reaction for the ions that form an insoluble hydroxide
with NaOH(aq) in the following chemical equilibrium mixture:
Fe3+
(aq) + 3SCN-
(aq) Fe(SCN)3(aq)
Fe3+
reacts with NaOH to form insoluble Fe (OH) 3 and the equation for the reaction is:
Fe3+
(aq) + 3OH-
Fe (OH)3.
 Explaining what would happen if more KSCN were added to the equilibrium mixture.

Consequently, on adding more of KSCN(aq) to the equilibrium mixture, the red colour
deepens because addition of KSCN increases the concentration of SCN-
causing equilibrium
to shift to right.
 Stating what will happen if more heat is applied to this reaction:
X2(g) + 3Y2 2XY3(g) H = - 92 KJmol-1
The reaction will shift from right to left favouring the production of X2 + 3Y2 (g) (reactants)
 Writing equilibrium constant for this reaction:
CaCO3(s) CaO(s) + CO2 (g)
Majority of the students expressed equilibrium constant as
Kc =
The CaCO3(s) and CaO(s) are not the concentration of the substances. Concentration can only
be expressed in solution.
 Explaining comprehensively the effects of increase pressure and temperature on equilibrium
reaction using Le-Chatelier’s Principle on this reaction:
N2 (g) + 3H2 (g) 2NH3 (g) H = - 92kJmol-1
Research Question 3c: What is the effect of the inquiry-based learning strategies on students’ conceptual
knowledge in chemical kinetics and chemical equilibrium?
From the results on Table 1, the mean gain of the students in the ID was 9.27 (40.52 %) while that of
their counterparts in PDID and TD were 6.96 (30.42 %) and 6.65 (29.05 %) respectively in both chemical
kinetics and chemical equilibrium. The pattern achievement in chemistry by learning strategies was ID > PDID
> TD. By topic, the students’ mean gain in the ID was 4.02, the PDID had 2.71 while the TD had 3.69 on
chemical kinetics. For chemical equilibrium, the students mean gain in the ID was 5.25 while the students in the
PDID and the TD were 4.25 and 2.96 respectively. The pattern of achievement was ID > TD > PDIP in
chemical kinetics and ID > PDID > TD in chemical equilibrium. These results indicated that ID inquiry-based
learning strategy was most effective for learning chemical kinetics and chemical equilibrium in chemistry.
Research Question 3d: How do the inquiry-based learning strategies affect students’ conceptions at the
three levels of content representation in chemical kinetics and chemical equilibrium?
The students’ achievements in the three levels of contents in the topics by learning strategies groups are
presented in Table 2.
From results on Table 2, the comparison of the mean gain scores on macroscopic, microscopic and symbolic
levels of the three learning strategies by chemistry topic was made. The results indicated that the students in the
TD group had the highest score on macroscopic level for chemical kinetics (2.32) and chemical equilibrium
(1.52) than the ID and the PDID strategies. The students in the ID learning strategy had the highest mean gain
score on microscopic level with 2.20 and 2.31 for chemical kinetics and chemical equilibrium respectively. The
ID learning strategy was also most effective for symbolic level for chemical kinetics with highest mean gain of
1.37 and 2.04 for chemical equilibrium.

Table 2: Mean Scores at Macroscopic, Microscopic and Symbolic Levels in Chemical Kinetics and
Learning
Strategy
Level of
Representation
Chemical Kinetics
Mean of
Pre-test Post-test Gain
Mean of
Pre-test Post-test Gain
ID
Macroscopic
Microscopic
Symbolic
Total Mean
2.74 3.19 0.45
2.62 4.82 2.20
2.35 3.72 1.37
11.73 7.71 4.02
2.32 3.22 0.90
2.26 4.57 2.31
2.38 4.42 2.04
6.96 12.21 5.25
PDID
Macroscopic
Microscopic
Symbolic
Total Mean
2.68 3.42 0.74
3.06 4.64 1.58
2.58 2.97 0.39
8.32 11.03 2.71
1.86 3.07 1.21
1.82 3.56 1.74
2.12 3.42 1.30
5.80 10.05 4.25
TD
Macroscopic
Microscopic
Symbolic
Total Mean
2.24 4.56 2.32
2.32 3.20 0.88
2.20 2.69 0.49
6.76 10.45 3.69
2.36 3.88 1.52
2.84 3.96 1.12
3.54 3.86 0.32
8.74 11.70 2.96
Bar chart was also used to represent students mean gain scores in the learning groups on levels of
content representations. The students mean gain scores on the three levels of conceptual knowledge by the
learning strategies on chemical kinetics and chemical equilibrium are pictorially represented and shown on
Figure 1 for better understanding of the findings.
Figure 1: Representation of Students’ Mean Gain at Macroscopic, Microscopic and Symbolic Levels by
Topic
0
0.5
1
1.5
2
2.5
Macro
Micro
Symobic
Macro
Micro
Symbolic
Macro
Micro
Symbolic
ID PDID TD
Chemical Kinetics

The Figure 1 indicated that the ID was most effective for microscopic and symbolic levels of conceptual
knowledge for both chemical kinetics and chemical equilibrium. The TD strategy was most effective for
macroscopic level in the two chemistry topics. The patterns of the students’ achievement on the three levels
content representations based on learning strategies for chemical kinetics topic are TD > PDID > ID for
macroscopic level; microscopic level, ID > PDIP > TD; and symbolic level was TD > ID > PDID. For chemical
equilibrium, the achievement patterns based on the learning strategies for macroscopic level was TD > PDID >
ID and ID > PDID > TD for both microscopic and symbolic levels.
VII. DISCUSSION
The active involvement of the students in carrying out practical activities, the discussions of findings among
themselves within a group and translations of what were observed during investigations to microscopic and
symbolic levels as the students reported their findings may have enhanced their achievement in conceptual
knowledge. The strategy encourages the students to express their ideas, opinions and reflect on the findings in
open dialogue. The students’ thoughts are clarified on the outcomes of their investigations as they dialogued
among themselves which consequently led to high quality learning. This finding is in support of Abungu, Okere
& Wachanga, 2014; Ehindero, Ojediran & Oludipe, 2014 and Adekunle, 2015 who found inquiry teaching
effective in promoting achievement and Guevara (2015) that found co-operative teaching effective for
enhancing academic achievement in science.
The Predict-Discuss-Investigate-Discuss being most effective than the Teacher Demonstration may be due
to the fact that the teacher’s role was shifted to the students which allowed for active participation of the
students rather than being passive in the teaching and learning process. The act of students making predictions,
discussing the predictions with members of the group, carried out investigations to see whether the predictions
and discussions made were appropriate to the findings from the investigations and modifications of the
predictions and discussions where necessary might have made the Predict-Discuss-Investigate-Discuss better
strategy than the Teacher Demonstration. The students’ misconceptions were modified after carrying out
investigations. The findings also made the students to express and modify their own views through open
dialogues and active participation hence, learning was enhanced. The observable concepts were translated to
microscopic (molecular) and symbolic (structural) representations as the students discussed and reported their
investigations. These assisted the students to improve their academic competence. This finding is in agreement
with Ogunleye & Babajide (2010) and Sesen & Tarhan (2013) who found that the Predict-Observed-Explain
teaching strategy enhances students’ understanding of scientific concepts in secondary schools.
VIII. CONCLUSION
The study has shown that active learning promotes students’ achievement of the macroscopic, microscopic
and symbolic levels in chemistry. Chemistry teachers should provide enriching and challenging learning
environment for students to explore for meaningful learning of scientific concepts. Chemistry students should be
allowed to interact with one another and discuss the knowledge constructed from the environment to enhance
their learning. Students pre-existing knowledge should be identified and appropriate instructions should be
employed for remediation when their conceptions is not consistent with scientific knowledge. Active
participation of students in teaching and learning processes promotes retention and learning of new concepts.
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